Collar Nut M12 x 1.5 MM For FS160 FS180 FS220 FS260 FS280 FS290 FS300 FS310 FS311 FS350 FS360 FS380 FS400 FS410 FS420 4119 642 7600 Fits clearing saw models FS 160, FS 180, FS 220, FS 220K, FS 260, FS 280, FS 280K, FS 290, FS 300, FS 310, FS 311, FS 350, FS 360, FS 360 C-EM, FS 380, FS 400, FS 410, FS 410C, FS 410 C-EM, FS 420, FS 420L, FS 450, FS 460, FS 460C, FS 460 C-EM K, FS 460RC, FS 480, FS 490 C-EM, and TrimCut 41-2 Designed for use with gear head part numbers 4147 640 0103 and 4147 640 0104 Not compatible with gear heads 4137 640 0100 and 4137 640 0102 Thread specification: M12 x 1.5 mm, left hand thread Package includes 5 collar nuts